Ultra-high strength and ultra-high modulus fibers from polyethylene

DSC investigation of high-strength and high-modulus polyethylene fibers

“…Zone-drawing was performed in a multi-step process by moving a heated narrow metal strip along the fiber axis with the temperature and load successively increasing. The temperature was varied stepwise from 403 K to 418 K. The drawing technique corresponds to that used by Marichin et al [5], and is quite similar to the method of Kunugi et al [6]. Melting endotherms and heats of fusion were determined with a Perkin-Elmer DSC 1B.…”

Direct electron microscope investigation of the morphology of surface-growth polyethylene filaments before and after zone-drawing

“…Zone-drawing was performed in a multi-step process by moving a heated narrow metal strip along the fibre axis with temperature and load successively increasing. The temperature varied stepwise from 130 to 145 ° C. The drawing technique corresponds to that used by Marichin et al [5], and is quite similar to the method of Kunugi et al [6]. A mechanical characterization of our fibre samples will be given elsewhere [19].…”

“…Among the various general routes towards highly oriented polymer systems, solution (including the gel state) processing under persistently elongational flow and stretching conditions has attracted considerable attention in recent years [1]. Surfacegrowth of ultra-high molecular weight polyethylene (UHMWPE) in a Couette apparatus [2], in particular, leads to fibres of exceptional mechanical properties which may be further improved by special drawing procedures, such as hot-drawing [3,4] or zone-drawing or zone-annealing, respectively [5,6].…”

Multiple‐step drawing innovative ultrahigh‐molecular‐weight polyethylene fibers modified with bacterial cellulose and scCO2‐aid

“…Ultradrawing and resultant σ tt s of UHMWPE/nanofiller fibers were favorably affected by the high specific‐surface‐areas (SSA sp s) of the nanofillers 12 . Multiple‐step drawing processing was applied to facilitate D ra or resultant σ tt of polyolefin films or crystal mats 28–34 . A relatively high tensile strength of ~5.5 GPa was acquired for a two‐step drawn UHMWPE fiber 32 .…”